1.
a. The balanced chemical equation is: Cl2 + 2NaOH → NaCl + NaClO2 + H2O
b. The molar to molar ratio of sodium hydroxide to sodium chloride is 2:1.
c. The name of NaClO2 is sodium chlorite. The two ions it forms are Na+ and ClO2-.
2.
a. The balanced chemical equation is: 2H2 + O2 → 2H2O
b. This is a synthesis reaction.
c. If you started with 250.0 grams of hydrogen, you would create 250.0 grams of water.
d. If you started with 250.0 grams of oxygen, you would create 125.0 grams of water.
e. Hydrogen is the limiting reactant.
3.
a. The limiting reagent is ammonia and the theoretical yield of nitric oxide is 5.70g.
b. 2.65g of excess reagent remains (ammonia).
4.
a. The balanced equation is: 3Si + 4N2 → 2Si3N4
b. 117.5 grams of silicon are needed to form 98.5 grams of silicon nitride.
c. Silicon is the limiting reagent and nitrogen is the excess reagent.
d. 25.5 grams of additional nitrogen are needed to produce 98.5 grams of product.
5.
a. The balanced chemical equation is: 2S + 3O2 → 2SO3
b. The theoretical yield of sulfur trioxide is 229.5 grams.
c. The percent yield of sulfur trioxide is calculated by (actual yield/theoretical yield) x 100%. In this case, it is (246.6/229.5) x 100% = 107.5%.